It is very common that Webcrims is not populated on matters like this prior to the court date. You can keep checking to see if the case gets docketed prior to the court date.
Even if the case is not docketed, you must appear in court.
Good Luck.
To answer your question, no - the fact that the summons does not appear on webcrims does not, in and of itself, mean that the summons was dismissed. That's not to say that the summons might be dismissed, but you should NOT miss the appearance just because you don't see it online. Find out in person if it's been dismissed.